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Create 3_way_quicksort.cpp #1029

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20 changes: 20 additions & 0 deletions Sorting/QuickSort/C++/3_way_quicksort.cpp
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Original file line number Diff line number Diff line change
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#include<bits/stdc++.h>
using namespace std;
void swap(int* arr,int a,int b){
int temp=arr[a];
arr[a]=arr[b];
arr[b]=temp;
}
void qs(int* arr,int start,int end){
if(start>=end)
return;
int pivot=arr[start];
int first=start,last=end,mid=start+1;
while(mid<=last){
if(arr[mid]<pivot) swap(arr,first++,mid++);
else if(arr[mid]>pivot) swap(arr,mid,last--);
else mid++;
}
qs(arr,start,first-1);
qs(arr,last+1,end);
}